Wanderlust has claimed the actions of some entrants harm the environment by leaving litter and causing erosion.

BBC: Three Peaks Challenge on Wanderlust endangered list

The 3, 000 reindeer are trampling native plants, causing erosion and endangering king penguins and other local birds by destroying their nests and habitat.

BBC: South Georgia prepares to cull its invasive reindeer

Ethanol mandates are prompting more and more corn to be planted on land that is poorly suited for agriculture, causing erosion and pesticide runoff to infiltrate groundwater and aquifer resources.

FORBES: Biofuels: Fields Of Pipedreams